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I figured it had to do with me grinding on something in there. It seems Pietta has welded one of the screws into it, and now that I have twisted the head into a spiral on the bits in my new Wheeler Gunsmith kit (apparently really soft metal), without blemishing or turning the offending screw, I await my new screwdriver bits from Chapman and give those a try. I'll also so some forum searching and order some kind of stone from Brownells too.
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